Comparison of Inconel 600 and Incoloy 825 pipes
Comparison of Inconel 600 and Incoloy 825 pipes
Inconel 600 tubing is a nickel-chromium alloy that performs exceptionally well in high-temperature applications and corrosive environments such as alkalis and strong acids. Incoloy 825 tubing is a nickel-iron-chromium alloy with added molybdenum, copper, and titanium, enabling it to withstand oxidizing and reducing conditions, particularly sulfuric acid and phosphoric acid. Incoloy 825 alloy tubing offers higher strength at high temperatures and is suitable for harsh chemical and oil and gas environments, while Inconel 600 tubing is renowned for its applications in chemical processing, nuclear reactors, and highly alkaline environments.
Can Inconel 600 alloy be welded?
Inconel 600 alloy can be welded using various methods, such as tungsten inert gas welding (GTAW) or argon arc welding (TIG). Other methods include gas metal arc welding (GMAW), gas metal arc welding (MIG), and plasma arc welding (PAW).
For decades, Inconel alloys have been a mainstay in materials engineering due to their superior corrosion resistance, high strength, and ability to maintain mechanical properties at high temperatures. Among the various Inconel alloy grades, Inconel 600 tubing and Incoloy 825 tubing are the two most commonly used alloys in industrial applications. While these two alloys share some similarities, their unique chemical compositions and properties make them suitable for different operating conditions. This article will delve into the main differences between Inconel 600 tubing and Incoloy 825 tubing, analyzing their chemical composition, mechanical properties, corrosion resistance, and application areas.
Comparison of chemical composition between Inconel 600 alloy tubing and Incoloy 825 tubing
| Element | Inconel 600 Tube (%) | Incoloy 825 Tube (%) |
|---|---|---|
| Nickel (Ni) | ≥ 72.0 | 38.0 - 46.0 |
| Chromium (Cr) | 14.0 - 17.0 | 19.5 - 23.5 |
| Iron (Fe) | 6.0 - 10.0 | ≥ 22.0 |
| Molybdenum (Mo) | - | 2.5 - 3.5 |
| Copper (Cu) | ≤ 0.5 | 1.5 - 3.0 |
| Titanium (Ti) | - | 0.6 - 1.2 |
| Carbon (C) | ≤ 0.15 | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 | ≤ 0.5 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.03 |
| Aluminum (Al) | - | ≤ 0.2 |
| Phosphorus (P) | ≤ 0.04 | ≤ 0.03 |
Mechanical Properties Comparison: Inconel 600 vs Incoloy 825 Tube
| Mechanical Property | Inconel 600 Tube (Annealed) | Incoloy 825 Tube (Annealed) |
|---|---|---|
| Tensile Strength | 550-655 MPa (80-95 ksi) | 586-689 MPa (85-100 ksi) |
| Yield Strength (0.2% Offset) | 240-310 MPa (35-45 ksi) | 241-345 MPa (35-50 ksi) |
| Elongation | 35-45% | 30-45% |
| Hardness (Brinell) | 150-220 HB | 150-210 HB |
| Hardness (Rockwell B) | 80-90 HRB | 75-85 HRB |
| Modulus of Elasticity | 214 GPa (31×10⁶ psi) | 196 GPa (28.4×10⁶ psi) |
| Shear Modulus | 79 GPa (11.5×10⁶ psi) | 74 GPa (10.7×10⁶ psi) |
| Poisson's Ratio | 0.29 | 0.28 |
| Fatigue Strength | 240-310 MPa (35-45 ksi) | 255-310 MPa (37-45 ksi) |
| Creep Strength | Excellent up to 1093°C (2000°F) | Good up to 540°C (1000°F) |
Comparison of Inconel 600 Tube and Incoloy 825 Pipe
| Feature | Inconel 600 Pipe | Incoloy 825 Pipe |
|---|---|---|
| Primary use | High-temperature applications, chemical processing, caustic alkalis production | Harsh chemical environments (sulfuric/phosphoric acids), oil and gas, nuclear fuel reprocessing |
| Composition | High nickel and chromium content | High nickel and iron content, with molybdenum, copper, and titanium |
| Corrosion Resistance | Strong in oxidizing and reducing environments, particularly against strong acids and alkalis | Exceptional resistance to both oxidizing and reducing acids (sulfuric and phosphoric), and stress corrosion cracking |
| Strength | Good mechanical properties at lower temperatures; strength may decrease at higher temperatures compared to Incoloy 825 | Superior strength at high temperatures |
| Applications | Chemical processing equipment, nuclear reactors, and heat exchangers | Chemical process equipment, oil and gas industry, pickling equipment, and flue gas desulfurization |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
Gnee Steel is a supplier of Inconel 600 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 600 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 600, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
